diff --git a/Plot1.R b/Plot1.R
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+
+# Reading, naming and subsetting power consumption data
+power <- read.table("household_power_consumption.txt",skip=1,sep=";")
+names(power) <- c("Date","Time","Global_active_power","Global_reactive_power","Voltage","Global_intensity","Sub_metering_1","Sub_metering_2","Sub_metering_3")
+subpower <- subset(power,power$Date=="1/2/2007" | power$Date =="2/2/2007")
+
+#PLOT 1
+# Transforming the Date and Time vars from characters into objects of type Date and POSIXlt respectively
+subpower$Date <- as.Date(subpower$Date, format="%d/%m/%Y")
+subpower$Time <- strptime(subpower$Time, format="%H:%M:%S")
+subpower[1:1440,"Time"] <- format(subpower[1:1440,"Time"],"2007-02-01 %H:%M:%S")
+subpower[1441:2880,"Time"] <- format(subpower[1441:2880,"Time"],"2007-02-02 %H:%M:%S")
+
+#calling the basic plot function
+pdf(file = "plot1")
+hist(as.numeric(as.character(subpower$Global_active_power)),col="blue",main="Global Active Power",xlab="Global Active Power(kilowatts)")
+
+# annotating graph
+title(main="Global Active Power")
+dev.off()
+dev.copy(png, file = "plot1")
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diff --git a/Plot1.png b/Plot1.png
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diff --git a/Plot2.R b/Plot2.R
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+
+#PLOT 2
+# Reading, naming and subsetting power consumption data
+power <- read.table("household_power_consumption.txt",skip=1,sep=";")
+names(power) <- c("Date","Time","Global_active_power","Global_reactive_power","Voltage","Global_intensity","Sub_metering_1","Sub_metering_2","Sub_metering_3")
+subpower <- subset(power,power$Date=="1/2/2007" | power$Date =="2/2/2007")
+
+# Transforming the Date and Time vars from characters into objects of type Date and POSIXlt respectively
+subpower$Date <- as.Date(subpower$Date, format="%d/%m/%Y")
+subpower$Time <- strptime(subpower$Time, format="%H:%M:%S")
+subpower[1:1440,"Time"] <- format(subpower[1:1440,"Time"],"2007-02-01 %H:%M:%S")
+subpower[1441:2880,"Time"] <- format(subpower[1441:2880,"Time"],"2007-02-02 %H:%M:%S")
+# calling the basic plot function
+pdf(file = "plot2")
+plot(subpower$Time,as.numeric(as.character(subpower$Global_active_power)),type="l",xlab="Time",ylab="Global Active Power (kilowatts)", col = "red") 
+
+# annotating graph
+title(main="Global Active Power over the week")
+dev.off()
+dev.copy(png, file = "plot2")
diff --git a/Plot2.png b/Plot2.png
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diff --git a/Plot3.R b/Plot3.R
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+#plot 3
+
+# Reading, naming and subsetting power consumption data
+power <- read.table("household_power_consumption.txt",skip=1,sep=";")
+names(power) <- c("Date","Time","Global_active_power","Global_reactive_power","Voltage","Global_intensity","Sub_metering_1","Sub_metering_2","Sub_metering_3")
+subpower <- subset(power,power$Date=="1/2/2007" | power$Date =="2/2/2007")
+
+# Transforming the Date and Time vars from characters into objects of type Date and POSIXlt respectively
+subpower$Date <- as.Date(subpower$Date, format="%d/%m/%Y")
+subpower$Time <- strptime(subpower$Time, format="%H:%M:%S")
+subpower[1:1440,"Time"] <- format(subpower[1:1440,"Time"],"2007-02-01 %H:%M:%S")
+subpower[1441:2880,"Time"] <- format(subpower[1441:2880,"Time"],"2007-02-02 %H:%M:%S")
+
+
+# calling the basic plot functions
+pdf(file = "plot3")
+plot(subpower$Time,subpower$Sub_metering_1,type="n",xlab="Time",ylab="Energy sub metering")
+with(subpower,lines(Time,as.numeric(as.character(Sub_metering_1))))
+with(subpower,lines(Time,as.numeric(as.character(Sub_metering_2)),col="green"))
+with(subpower,lines(Time,as.numeric(as.character(Sub_metering_3)),col="blue"))
+legend("topright", lty=1, col=c("black","green","blue"),legend=c("Sub_metering_1","Sub_metering_2","Sub_metering_3"))
+
+# annotating graph
+title(main="Energy sub-metering")
+dev.off()
+dev.copy(png, file = "plot3")
diff --git a/Plot3.png b/Plot3.png
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diff --git a/Plot4.R b/Plot4.R
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+#plot4
+# Reading, naming and subsetting power consumption data
+power <- read.table("household_power_consumption.txt",skip=1,sep=";")
+names(power) <- c("Date","Time","Global_active_power","Global_reactive_power","Voltage","Global_intensity","Sub_metering_1","Sub_metering_2","Sub_metering_3")
+subpower <- subset(power,power$Date=="1/2/2007" | power$Date =="2/2/2007")
+
+# Transforming the Date and Time vars from characters into objects of type Date and POSIXlt respectively
+subpower$Date <- as.Date(subpower$Date, format="%d/%m/%Y")
+subpower$Time <- strptime(subpower$Time, format="%H:%M:%S")
+subpower[1:1440,"Time"] <- format(subpower[1:1440,"Time"],"2007-02-01 %H:%M:%S")
+subpower[1441:2880,"Time"] <- format(subpower[1441:2880,"Time"],"2007-02-02 %H:%M:%S")
+
+
+# initiating a composite plot with many graphs
+par(mfrow=c(2,2))
+
+# calling the basic plot function that calls different plot functions to build the 4 plots that form the graph
+pdf(file = "plot4")
+with(subpower,{
+  plot(subpower$Time,as.numeric(as.character(subpower$Global_active_power)),type="l",  xlab="Time",ylab="Global Active Power", col = "red")  
+  plot(subpower$Time,as.numeric(as.character(subpower$Voltage)), type="l",xlab="Time",ylab="Voltage", col = "purple")
+  plot(subpower$Time,subpower$Sub_metering_1,type="n",xlab="Time",ylab="Energy sub metering")
+  with(subpower,lines(Time,as.numeric(as.character(Sub_metering_1))))
+  with(subpower,lines(Time,as.numeric(as.character(Sub_metering_2)),col="green"))
+  with(subpower,lines(Time,as.numeric(as.character(Sub_metering_3)),col="blue"))
+  legend("topright", lty=1, col=c("black","green","blue"),legend=c("Sub_metering_1","Sub_metering_2","Sub_metering_3"), cex = 0.6)
+  plot(subpower$Time,as.numeric(as.character(subpower$Global_reactive_power)),type="l",xlab="Time",ylab="Global_reactive_power", col = "pink")
+})
+dev.off()
+dev.copy(png, file = "plot4")
+
+
diff --git a/Plot4.png b/Plot4.png
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